// StyleSwitcher by Paul Sowden [http://www.alistapart.com/stories/alternate/]

function setActiveStylesheet(title) {
	var i, a, main;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
			a.disabled = true;
			if(a.getAttribute("title") == title) a.disabled = false;
		}
	}
}

function getActiveStylesheet() {
	var i, a;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
		if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title") && !a.disabled) return a.getAttribute("title");
	}
	return null;
}

function getPreferredStylesheet() {
	var i, a;
	for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
	    if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("rel").indexOf("alt") == -1 && a.getAttribute("title")) return a.getAttribute("title");
	}
	return null;
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

window.onload = function() {
	var cookie = readCookie("font-size");
	var title = cookie ? cookie : getPreferredStylesheet();
	setActiveStylesheet(title);
}

window.onunload = function() {
	var title = getActiveStylesheet();
	createCookie("font-size", title, 365);
}

var cookie = readCookie("font-size");
var title = cookie ? cookie : getPreferredStylesheet();
setActiveStylesheet(title);

document.writeln('<p id="font-size">');
	document.writeln('<em>Schriftgröße<\/em> ');
	document.writeln('<a href="#" onclick="setActiveStylesheet(\'normale Schriftgröße\'); return false;" title="normale Schriftgröße" class="small"><img src="/assets/slt/gen/img/bas/btn-small.gif" alt="normale Schriftgröße" \/><\/a><span>,</span> ');
	document.writeln('<a href="#" onclick="setActiveStylesheet(\'mittlere Schriftgröße\'); return false;" title="mittlere Schriftgröße" class="medium"><img src="/assets/slt/gen/img/bas/btn-medium.gif" alt="mittlere Schriftgröße" \/><\/a><span>,</span> ');
	document.writeln('<a href="#" onclick="setActiveStylesheet(\'große Schriftgröße\'); return false;" title="große Schriftgröße" class="large"><img src="/assets/slt/gen/img/bas/btn-large.gif" alt="große Schriftgröße" \/><\/a>');
document.writeln('<\/p>');